Internal-combustion engine



May 12, 1925. 1,537,351 H. A. HALL INTERNAL COMBUSTION ENGINE Filed Dec. 26, 1924 67660172 Pyy,

Patented May 12, 1925.

UNITED STATES r 1,537,351 PATENT OFFICE.

HAROLD A. HALL, OF L GATOS, CALIFORNIA, ASSIGNOB OF ONE-HALF TO EAR/TIE C. FANCHER, OFSAN JOSE, CALIFORNIA.

INTERNAL-COMBUSTION Application filed December as, 1924. Serial No. 758,058.

V citizen of the United States, residing at present known types.

Los Gatos, in the county of Santa Clara and State of California, have invented certain new and useful Improvements 'in Internal-Combustion Engines, of which the following is a specification.

My invention relatesto internal combustion engines, and more particularly to a valve construction therefor.

The object, of my invention is to provide means for assisting the cooling of the valves, and especially the exhaust valves, of an engine, thereby permitting higher compression and increased power and efiiciency without danger of damage to the valves through overheating. Another .advantage lies in the fact that the valves arranged according to the principles of my invention will operate, on account of their lower temperature, for a longer time without grinding-or reseating, thereby reducing the cost of upkeep of the engine, and enabling it to be kept in service for a longer. time without repair than is customary with engines of the My invention will be described, and is herewith illustrated, as embodied in an engine of the T-head type having poppet valves, and as applied only to the exhaust valves 'thereof, but it is to be distinctly understood that the principles of the invention may be equally well applied, without material change, to engines ,of other types, or to the inlet as well as the exhaust valves, or even to engines having other types of valves. The embodiment of the invention herein disclosed has been chosen merely for purposes of illustratiomwith the understanding that changes, within the scope of the claims hereto appended, may be made in the form, construction, and farrangement of the parts without departing from the essential principles of the invention as expressed in said claims. As a matter of purely mechanical consideration, the

I exhaust valves of an engine are more subject to overheating than are the inlet valves, and for that reason my invention is shown as applied only to the exhaust valves, but it will be-obvious that the inlet valves may be similarly arranged without requiring the exercise of more than ordinary mechanical skill.

With this in view, my invention will now i be fully described with reference to the accompanying drawings, wherein- Fig. 1 is a transverse. section through one cylinder of an engine having my invention embodied therein.

Fig. 2 is a View, partly in section, of the exhaust valve mechanism of the cylinder shown in Fig. 1, and is taken on the line 22 thereof. v

vFig. 3 is a sectional plan view taken on the line 3-3 of Fig. 1. i

In the drawings, the reference numeral 1 designates the cylinder of an engine, which may be cooled in any well known manner, as for example by a water jacket 1'. 2 is the piston operable in said cylinder, 3 is the crankshaft, 4 is the connecting rod, and 5 is the inlet valve for admitting gas or air to the cylinder 1 from the port 6. Said valve 5 is operated in the usual manner, being closed by a spring 7 and opened by a cam 8, the latter secured upon a cam shaft 9 and acting upon the valve through a tappet 10.

I provide a plurality of exhaust valves 11. two being shown in Figs. 2 and 3, for discharging the spent gases into a common port 12, Figs. 1 and 2. Said valves 11 are closed by springs 13 in the usual manner, and are opened, alternately, by. cams 14: secured upon a cam shaft 15 and acting through tappets 16.

Ina four-cycle engine, the inlet cam shaft 9 is rotated, as usual, at half the speed of the crank shaft 8, but the exhaust cam shaft '15 is rotated at quarter the speed of said crankshaft. Any Well known means may be provided for driving the cam shafts 9 and 15 at the required speeds. For example, asvsho'wn in Fig. 1, said shafts may 'be provided-with sprockets l7 and 18 re spectively, and driven by a single chain 19 passing over a sprocket 20 upon the crank shaft 3. Obviously, the sprocket 17 must be twice the diameter of the crank shaft sprocket 20, and the sprocket 18 must be four times the diameter thereof. 7

valve open at each exhaust stroke, but each suchvalve opens only once in every two seated only through three-quarters'of thev xcycle As before stated, increasedcooling of the exhaust valves in'an engine embodying any invention enables the use of a higher compression, and also enables the engine to be operated longer Without necessitatinggrinding the valves, than, is the case in,the

' 'for opening said valve at each intake stroke usual type of engine.

I claim: 4 1. In an engine having .a cylinder with a piston operable. therein, said cylinder having a port for-the passage of the impelling fluid; a plurality of valves for controlling said port; and means for operating sajid valves sucoessivelv in timed relation to the piston movement.. i

" '2'. In an engi plurality of .ing an exhaust-port; a plurality ne having a cylinder vvitli n piston operable therein, said cylinder having aninlet port and an exhaustport; a valves for controlling one of said ports; and means for operating said valves successively in proper timed relation to the movements of said-piston.

3. In an engine having a cylinder with a piston operable therein, said cylinder' havof valves for controlling said. port;- and means for operating sa'id' valves successively, one such I valve being openedat each exhaust stroke of said piston.

4. In an engine having a cylinder with a piston operable therein, said cylinder having ani'nle-t port and an exhaust port; a valve for controlling said inlet port; means of said piston; a plurality of valves for controlling said exhaust port; and means for operatmg said exhaust valves successively, one thereof being opened at each exhaust stroke of said piston.

- .In' testimony whereof I have name to this specification.

. HAROLD rL HALL.

v 50'- signed my 

